Allium tricoccum |
Allium robinsonii |
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ramp, small white leek, wild leek |
Robinson's onion |
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Bulbs | 2–6, usually borne on short rhizome, ovoid-conic, 1.5–6 × 1.5–3 cm; outer coats enclosing 1 or more bulbs, brownish to grayish, reticulate, cells finely fibrous; inner coat white, obscurely cellular, cells irregularly arranged. |
1–3+, not clustered on stout primary rhizome, rhizomes absent, renewal bulbs formed within coats of parent bulb, increase bulbs absent or 1–2, ± equaling parent bulbs, never appearing as basal cluster, ovoid, 1–2 cm × 8–15 mm; outer coats grayish to brownish, membranous, lacking cellular reticulation or cells arranged in only 2–3 rows distal to roots, ± quadrate, without fibers; inner coats white, cells absent or ± quadrate. |
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Leaves | ephemeral, usually absent at anthesis, 2–3, basal; blade solid, flat, elliptic to elliptic-lanceolate, (15–)20–30(–40) cm × 15–90 mm, tapering to long, slender petiole, margins entire. |
usually deciduous with scape, 2, basally sheathing, sheaths not extending much above soil surface; blade solid, flat, strongly falcate, 5–18 cm × 1–2 mm, margins entire. |
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Scape | persistent, solitary, flexuous distally, terete, 10–40 cm × 2–4 mm. |
usually forming abcission layer and deciduous with leaves after seeds mature, frequently breaking at this level after pressing, solitary, erect, solid, flattened, slightly 2-edged, 3–7 cm × 1–3 mm. |
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Umbel | persistent, erect, loose, (6–)30–50-flowered, obconic to ± hemispheric, bulbils unknown; spathe bracts persistent, 2, ± 3-veined, lanceolate to lance-ovate, ± equal, apex acute, beakless. |
deciduous with scape, erect, compact, 5–12-flowered, hemispheric, bulbils unknown; spathe bracts persistent, 2, 5–8-veined, ovate, ± equal, apex abruptly acute. |
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Flowers | campanulate, 4–7 mm; tepals erect, white to cream or yellowish, oblong to ovate, ± equal, not withering in fruit, margins entire, apex obtuse; stamens ± equaling tepals; anthers white to light yellow; pollen white; ovary crestless; style included, linear, shorter than stamens; stigma capitate, scarcely thickened, unlobed; pedicel 10–20 mm. |
campanulate, 7–9 mm; tepals erect, white to pale pink with red midribs, oblong, ± equal, becoming papery and not carinate in fruit, margins entire, apex obtuse; stamens included; anthers purple; pollen gray or yellow; ovary ± distinctly crested; processes 3 or 6, central, low, rounded, margins entire; style included, linear; stigma capitate, unlobed; pedicel 3–12 mm. |
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Seed | coat shining; cells smooth. |
coat dull; cells smooth. |
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2n | = 14. |
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Allium tricoccum |
Allium robinsonii |
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Phenology | Flowering Apr–May. | |||||
Habitat | Sand and gravel deposits along bottom and lower benches of Columbia River | |||||
Elevation | 50–200 m (200–700 ft) | |||||
Distribution |
e North America
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OR; WA
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Discussion | Varieties 2 (2 in the flora). (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Allium robinsonii has been found along the Columbia River from Ferry County, northeastern Washington, to about the mouth of the John Day River, north-central Oregon, and is now possibly extirpated from Oregon. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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Key |
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Source | FNA vol. 26, p. 234. | FNA vol. 26, p. 276. | ||||
Parent taxa | Liliaceae > Allium | Liliaceae > Allium | ||||
Sibling taxa | ||||||
Subordinate taxa | ||||||
Name authority | Solander: in W. Aiton, Hort. Kew 1: 428. (1789) | L. F. Henderson: Rhodora 32: 22. (1930) | ||||
Web links |